456 



INDEX. 



Page. 



Lower Huronian sediments, granite dikes in 356-357 



Knife Lake area of ._ ---- 297-349 



metamorphism of — 419 



relations of, to adjacent formations . . - 281-284, 303-308 



to dikes 283-284 



to Dulutli gabbro 407 



to Giants Eange granite 264,283,356-a57 



to granite of Vermilion Lake 254-256 



to Gunflint formation 388-389 



to Saganaga granite 268-273 



to Snowbank granite 363 



to Upper Hnronian 97-98,308-307 



petrographlc charactera ot 284-295, 



309-313, 327-328, 336-339, 344-846 



stratlgrapblc place of 308 



structure of 278-281,299-303 



Vermilion Lake, area of 277-296 



Lower Kewatln rocks, occurrence and character 



of 118-119 



Lowest point in district, location of B4 



Ml. 



Mackenzie, Alexander, explorations made by 57-63 



Magnetltic chert, plate showing 168 



Mallmann, John, exploratory work by 214 



Manltou rocks, character, thickness, and extent of. 124 



Marquette district, iron-ore deposits in 22 



Marquette series, character and thickness of 88-89 



equivalents of 92 



Marquettian, name proposed 88 



Maurer,E. R., acknowledgments to 31 



Mayhew Lake, Duluth gabbroat.. 403 



Merriam, W. N., oita,tion from, on iron-bearing 



rocks of Gunflint formation 385 



on Logan sills 399 



geologic work in Vermilion district done by 17, 



30,31,33 

 sketches of folds in Soudan f ornaation made by. 176 



Mesabi range, course and general features of 35-36 



geology of 114-116 



origin of name of 35 



metamorphic contact of gabbro and slate in 394 



See also Giants range. 



Mesabi series, equivalents of.. 92 



occurrence of... 121 



Metabasalt, plate showing 168 



Mica-schist derived from greenstones, composition 



of. 157 



Mining, methods of.,... 234,241 



Minnesota, copper minerals of 113 



crystalline rocks of 106-107 



ore deposits of 113 



Minnesota Geological Survey, reports of, citation 

 from, on altitude of highest point in dis- 

 trict 34 



citation from, on Mesabi and Giants ranges. 35 



on island in Kawlshiwi Elver 41 



on Stuntz conglomerate 278 



on Ogishke conglomerate 304 



on Agawa formation 325 



on Cacaquabic granite 364 



on titanif erous magnetite at Iron Lake 403 



on Logan sills. 409 



on augite-granite cut by hornblende granite. 362 

 See also Wlnchell, Grant, and other Minnesota 



Minnesota Iron Company, view showing filling sys- 

 tem of :..'.. 236 



Minnesota mine, view of main-level timbering at . . 236 



Mlshiwishiwi. See Kawlshiwi. 



Montalban group of Vermilion district, rocks com- 

 posing 76 



Moose Lake, Agawa formation near 325, 



326,329,330,333-335 



amygdaloldal rocks at 146 



breccias near 137,305 



conglomerate at 206,304,317 



conglomerate and greenstones at, relations of . . 206, 



303,304 



dikes at 261 



Ely greenstone near, relations of 132, 206 



glacial deposits near.. 428 



granite at and near 261, 264-265 



greenstone at 132,135-136,206 



greenstone conglomerate at. 312 



greenstones, ellipsoidal, at 148-149 



greenstones, porphy ritlc, near 348-349 



iron-bearing formation near, relations of 205-207 



jasper infolded in greenstone at 192 



Lower Huronian rocks at 297,298 



Ogishke conglomerate at and near 209,303,304,317 



relbungs-brecclas at 305 



rocks at, figure showing 206 



slates at 302,:ai,a37 



slate fragments in conglomerate at 304 



Soudan formation near 172 



structure at 1)35 



topography and geology at 433 



Mud Creek, granite dikes near 256 



Mud Creek Bay, chert veins in acid porphyry at . . . 191 ' 



conglomerate at 288 



granite dike in greenstone at 255 



granite-porphyry dike at 257 



granitic intrusions in schist at 262 



intrusive rocks in Iron-bearing formation at 199 



Muldrow, Robert, work done by 17 



Muscovado, occurrence of, at Gobbemichigamma 



Lake 88,343 



Muskegs, occurrence and character of 33 



Newfound Lake, Agawa formation at 335 



greenstone and granite at 172 



glacial deposits near 428 



graywackesat 337 



metamorphlsm at 173 



Nickel, occurrence of , in Duluth gabbro 421 



Nipigon series, age and character of 106 



stratigraphlc place of 99 



See also Keweenawan. 



North Twin Lake, jasper near 189 



spherulitic greenstones near 142, 168 



Norwood, J. G., cited on iron ore in the district 29 



geologic work in district done by 65-66 



publication of occurrence of iron ore by 22,213 



Norwood Lake, site of 430 



Oak Lake, arkose at 270 



Ogishke conglomerate, age of 33, 105, 284, 308, 406 



anticlinal position of 279 



character of 23-24, 81, 284r-285, 309-313 



